<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <Car
          @addfn="addfn"
          @subfn="subfn"
          @delfn="delfn"
          :index="index"
          v-for="(item, index) in goodList"
          :key="index"
          :list="item"
        ></Car>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ isallprice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import Car from "./components/car.vue";
export default {
  components: {
    Car,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: true,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods: {
    delfn(index) {
      this.goodList.splice(index, 1);
    },
    addfn(ind) {
      // console.log(this.goodList[ind]);
      this.goodList[ind].num++;
    },
    subfn(ind) {
      // console.log(this.goodList[ind]);
      if (this.goodList[ind].num == 1) {
        return;
      }
      this.goodList[ind].num--;
    },
  },
  computed: {
    isallprice() {
      // 合计功能
      return this.goodList.reduce(
        (sum, obj) => (sum += obj.price * obj.num),
        0
      );
    },
    isAll: {
      set(val) {
        return this.goodList.forEach((item) => {
          item.checked = val;
        });
      },
      get() {
        return this.goodList.every((obj) => obj.checked == true);
      },
    },
  },
};
</script>

<style>
</style>